Loom dobby



June 26,1923 V 1,674,862 Y A.-A.GoRDoN LOOM DOBBY Filed Aug. e, 1926 @i *WW/@M Patented .lune 26, 1928..

STATES arent ALBERT A. GORDGN, OF VORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMPTON @s Knownns Looivr wenns,

MASSACHUSETTS.

Application :filed August 6, 1926.

This invention relates to improvements in dobbies'for looms and it is'the general object of the invention to provide a loom so constructed as to provide increased leverage between the dobby levery and the harness lever to ythe end fthat a greater shed can be produced with a minimum motion on the part of the dobby hooks and levers.

The invention relates more particularly A to soecalled name dobbies and is -similar in some respects to the device shown in my previous Patent No. 1,060,977. Such mechanisms: are much smaller than the usual d obby but the shed formed'by the harness levers must of course be as large as that formed by the usual harnessmotions and it is a further object of my invention to improve upon the construction. of so-called name dobbies b y pivoting the levers which control the harness cords'at a point intermediate the ends ofthe Ldobby levers, so that the motion of the @dobby lever may be multiplied more than has been po-ssible heretofore.

yIt a Afurther vobject of my invention to improve upon the connection between the dobby lever and the dobbyhook by making the former `lof two substantially similar vpressed steel `p )arts having Vflared openings through which projects a solid stud land around which lies the hub of the dobby hook. lVith these and yother objects in view which will .appear as the description proceeds, my invention resides in' the combination and arrangement lof parts hereinafter described and 'set forth in the claims. ln the accompanying drawings wherein l have shown a convenient embodiment of my invention, Y'

lFig. 1 is a vertical central section through a `dobby constructed according to my invention,

Fig. 2 is an enlarged elevation of one of my improved dobb-y levers,

Figf?) is an en d elevation looking in the direction of arrow 3, Fig. 2, n

Fig. 4 is an enlarged horizontal section on line 4--4 of Fig. 2 and Fig is a fragmentary ytop plan taken in the direction of'arrow 5,Fig.l1. y Referring to the drawings it will be seen that I Vhave .provided a. loom frame 10 which in the case of name dobbies is one of the archesofthe loom and l have. bolted or otherwise secured. thereto a stand 11 having CII 0F W'ORGESTER, MASSACHUSETTS A CORPORATION OF Leon nonBY.

Serial No. 127,696.

a shaft 12 rotatably supported thereon. Sad shaft moves a pattern cylinder 13 which in turn advances the bars or link-s 14 yof the pattern kchain preferably every other pick of the loom, the dobby being of the socalled double index type. A fixed rod 15 is supported on the stand and has pivot-ally mounted thereon a number of dobby fingers certain of which as indicated at 16 are provided with upwardly extended arms 17 and others of which as indicated at 18 are provided with downwardly extending arms 19. Said dobby fingers are supported on their outer end-s by a bar 2O secured to the stand 11 and having a. plurality of separating wires21 to keep the dobby fingers properly spaced.

A rocker shaft 22 is mounted for oscillaf tion in the stand 11 and is keyed to a ,rocker arm 23 one end of which is connected to a vertically` reciprocating actuator rod 24e re- Ceiving an operative movement every pick of the loom, being depressed on one pick and elevated on the next. A knife frame 25 is secured to the shaft 22 and i-s provided with upper and lower hook engaging knife edges 26 and 27, respectively, said edges moving abo-ut the shaft 22 and one of them having an idle stroke to the right as the other has an operative stroke to the left. Said knife edges engage the upper and lower hooks 28 and 29, respectively, when said hooks are in lowered position. Each upper hook is positioned vertically by means of a wire 30 the upper end of which supports the corresponding hook and the lower end of which rests on one of the arms 19. The lower hooks are positioned vertically. by direct engagement with the arms 17. Said upper and 4G secured to the stand 11 and having mounted thereon av plurality of harness secured to the dobby stand..

`the bearing 46 while the levers 41. Each lever has an arm extending to the right as indicated in Fig. 1 and provided with an eye 42 which controls one or more warp threads by means of cords 43.

The dobby lever as shown more particularly in Figs. 2 and 3 is formed of a pair of similar parts 44, each part being ollset adjacent both ends and being secured together in any approved manner as by the spot welding indicated at 45. The central portions of the parts 44 lie closely adjacent each other and are provided with aligning openings 46 through which extend the lugs 47 of the harness levers 41. One ai'm of each rdobby lever extends upwardly and radially from other is curved as shown in Fig. 2 so that the major portion of the space lying between the bearing 46 and the bottom of the lever is unoccupied by parts of the lever. The object of this construction as shown in Iiig. 1 is to provide room for the rod and the bearing portions of the harness levers 41. In this way the rod 40 can lie between the center ofthe dobby lever and one of the ends thereof. By this simple` construction I am able to get the requisite shed without using the compound leverage which was necessary in the dobby shown in my aforesaid patent.

My invention further relates to an improved connection between the dobby hook and the dobby lever and by referring to F ig. 4 it will be seen that I have provided Veach portion 44 with an inwardly bent Harige 48, the flanges of the two parts abutting' each other to space the offset ends of the parts 44. These flanges are .then passed through the openings 49 in the Y ends of the hooks, after which. a rivet 50 is 'passed through the Y openings 51 left in the portions 44 when the flanges are punched out.

The rivet is expanded to draw said portions together as indicated in Fig. 4.

The thickness of the hooks is somewhat less than the space lying between the offset portions 44 and for this reason said hooks are permitted a free movement about the flanges 48 as a pivot. By reason of the constructionvjust described I am enabled to use a hook of-,uniform thickness and provide for its pivotal mounting merely by punching a hole therethrough, this kconstruction dilfering from the usual form of hook which has a lug extending on 'each side thereof to be received by parallel spacedl wings of the usual dobby lever. j

In operation the rod 24 rocks the knives i 26 and 27 back and forth and the latter will engage any of the hooks which happen to be 60 in lowered position. As shown in Fig. 1 the first lever is unmoved because of the fact that the hooks connected thereto are both in raisedposition, but the lever behind it has had the upper portion thereof moved to the left by engagement of its hook with the ff Y 1,674,862

knife edge 26. This motion produces a lifting movement of the corresponding harness lever 41 about the i'od 40, which, as clearly shown in tl'iedrawings, will give a sufficient shed, 'c .Y

Still another feature of my invention is shown in Fig. 5, wherein it will be seen that there are fewer separating wires or pins 21 than usual in dobby construction. Alter nate lingers, such as those indicated at 16, are of the'usual length and there is a separating gers. "lhe other lingers 18 are shorter'and are in alignment with the pins 21, being held in place by the longer lingers which in turn are In this way I amable to guide the fingers by fewer wires than are ordinarily used. IVY

have found in practice that one wire foi every lingers, and I do not wish to be limited to the particular arangement set forth herein.

The members 44 of the dobbyV lever are formed with ears 52 which as shown in Fig.

1 overlap when any lever has received itsl maximum movement bors. being proper alignmentofthe dobby levers.

From the foregoing it will bey seen that I relatively toits neighV` This construction prevents one lever have provided a dobby wherein thejpivotal a two-part dobby levervso arranged that loff-k set portions-.of the sheet metal parts which form the dobby lever form a'bearing for the hook. Also the lingers are separated by a fewer numberof pinsor wires than have usually been employed 4by making certain of said lingers shorter than the others. Furpin between each pair of such fin-N positioned by the pins or wires 21.

six fingers is sufhcient to guide the` caught on another and thus insures thermore, the ears 52 serve to keep the dobby levers'properly spaced and aligned. Having thus described my invention itwill be apparent that changes and modifications may be made therein by those skilled in the art without departing fromthe spirit and scope of the invention, and I do'not wish to be limited to the'details herein disclosed, but what I claim is: Y l

-1. In a dobby lever for looms, a pair of similarly formed members secured together. the ends of each member being olfset and said ends having holes therethroughjsurrounded by flanges projecting from the memf i bers, the two members when assembled ca using ,they flanges to abut each other ,having an opening to receive a hook pivotally liso mounted on the flanges, and securing means passing through the holes to hold the flanges together, whereby said flanges form a pivotal support for the hook. l

2. A lever for a loom dobby comprising a pair of similarly formed members secure together', said members being spaced adjacent the ends of' the lever, flanges struck from adjacent parts of the members and exie tending toward each other and held together when the members are assembled, and a hook having a portion near the flanges with a transverse opening therein through which the flanges extend to form a pivotal support for the hooks.

3. A lever for a loom dobby formed of a pair of similarly formed sheet steel members, each member having an offset end and said ends defining a space when the members are assembled, a substantially circular flange struck from each member, the flanges being in alignment and located in the space between the offset ends, and a hook having a portion near the flanges with a transverse opening therein through which the flanges pass to form a pivotal connection between the dobby levers and the hooks.

4. A llever for a loom dobby formed of a pair of similarly formed sheet steel members, each member having an offset end and said ends defining a space when the members are assembled, a substantially circular flange struck from each member, the flanges being in alignment and located in the space between the oset ends, a hook having a portion near the flanges with a transverse opening therein through which the flanges pass to form a pivotal connectionbetween the dobby levers and the hooks, and a rivet eX- tending through the member and the flanges to hold the latter together.

In testimony whereof Ihave hereunto affixed my signature.

ALBERT A. GORDON. 

